linux-kernel - Re: [LTP] [PATCH] mm: as the same logic with queue_pages

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Date:   Wed, 13 Sep 2023 11:10:10 +0200
From:   Cyril Hrubis <chrubis@...e.cz>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Edward AD <eadavis@...a.com>,
        syzbot+b591856e0f0139f83023@...kaller.appspotmail.com,
        lkp@...el.com, syzkaller-bugs@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        oe-lkp@...ts.linux.dev, akpm@...ux-foundation.org,
        ltp@...ts.linux.it
Subject: Re: [LTP] [PATCH] mm: as the same logic with queue_pages_range

Hi!
> Running tests.......
> <<<test_start>>>
> tag=vma02 stime=1694438526
> cmdline="vma02"
> contacts=""
> analysis=exit
> <<<test_output>>>
> vma02       0  TINFO  :  pid = 3639 addr = 0x7f5202dd6000
> vma02       0  TINFO  :  start = 0x7f5202dd6000, end = 0x7f5202dd7000
> vma02       0  TINFO  :  start = 0x7f5202dd7000, end = 0x7f5202dd8000
> vma02       0  TINFO  :  start = 0x7f5202dd8000, end = 0x7f5202dd9000
> vma02       1  TFAIL  :  vma02.c:144: >1 unmerged VMAs.
> incrementing stop

So the test is reproducer for:

commit 9d8cebd4bcd7c3878462fdfda34bbcdeb4df7ef4
Author: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Date:   Fri Mar 5 13:41:57 2010 -0800

    mm: fix mbind vma merge problem

    Strangely, current mbind() doesn't merge vma with neighbor vma although it's possible.
    Unfortunately, many vma can reduce performance...


And what the test does is:

- map 3 continous pages
- popluate
- mbind() first page
- mbind() all three pages
- checks that there is only single VMA for the pages after second
  mbind()

-- 
Cyril Hrubis
chrubis@...e.cz